1560s, gais, from French gaze, which is of uncertain origin. It has been conjectured to be from Arabic gazz "raw silk" [Barnhart], or from Gaza, Palestinian city associated with production of this fabric [Klein, Du Cagne], but Century Dictionary calls the latter conjecture, and there has been no evidence for either.
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Harper, D. (n.d.). Etymology of Gaza. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/Gaza